/* XzCrc64.c -- CRC64 calculation
   2009-04-15 : Igor Pavlov : Public domain */

#include "Types.h"

#include "XzCrc64.h"

#define kCrc64Poly 0xC96C5795D7870F42
UInt64 g_Crc64Table[256];

void MY_FAST_CALL Crc64GenerateTable()
{
    UInt32 i;
    for (i = 0; i < 256; i++)
    {
        UInt64 r = i;
        int j;
        for (j = 0; j < 8; j++)
            r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
        g_Crc64Table[i] = r;
    }
}

UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void* data, size_t size)
{
    const Byte* p = (const Byte*)data;
    for (; size > 0; size--, p++)
        v = CRC64_UPDATE_BYTE(v, *p);
    return v;
}

UInt64 MY_FAST_CALL Crc64Calc(const void* data, size_t size)
{
    return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
}